Lunar Meteorite: Dar al Gani 400 & 1058 (paired stones)

Libya


Dar al Gani 400 in the Libyan desert Dar al Gani 400 in the desert.
(Photo by anonymous finder)
Dar al Gani 400 in the laboratory A sawn slab of DaG 400 meteorite in the laboratory.  The maximum dimension is ~9 cm.  The rock appears to be a regolith breccia with at least one large melt-breccia clast (left of center).  Sample courtesy of Steve Arnold.  Click on image for enlargement (146 kb).
(Photo by Randy Korotev)


Two sides of a small slab of Dar al Gani 400. Millimeter ticks on scale
(Photos by Randy Korotev)


Two sides of another small slab of Dar al Gani 400. Millimeter ticks on scale.
(Photos by Randy Korotev)


Here's a slice of DaG 400 containing a vesicular clast of glassy impact-melt breccia (right).
(Photo courtesy of Chris Handler)


Another slice of DaG 400 with a clast of some plutonic rock, probably a norite (~2 cm wide).
(Photo Courtesy of Greg Hupé)

Exterior of sawn-in-two DaG 1058. Scale unknown.
(Photo courtesy of Heritage Auctions)


Sawn faces of DaG 1058. Scale unknown.
(Photo courtesy of Heritage Auctions)



DaG 400 is the first lunar meteorite to be recognized from Africa.

Together, at 3.24 kg, DaG 400/1058 is one of the biggest lunar meteorites.

  

from The Meteoritical Bulletin, No. 82, Meteoritics & Planetary Science 33, A221–A240 (1998)

Dar al Gani 400

Libya
Found 1998 March 10

Lunar meteorite (anorthositic breccia)

A 1.425 kg stone was found in Dar al Gani in the Libyan Sahara.

Classification and description (J. Zipfel, MPI): the meteorite is partly covered with a brownish fusion crust; fresh surfaces are gray to dark gray; matrix is well consolidated; clasts include subophitic and fine-grained to microporphyritic impact-melt breccias, granulitic fragments, intergranularly recrystallized anorthosites, and mineral fragments; chemical and O isotope composition is characteristic of lunar highland meteorites (Zipfel et al., 1998b); abundances and composition of noble gases do not suggest a pairing with DaG 262 (Scherer et al., 1998b). For further details, see Zipfel et al. (1998b). Type specimen and two polished sections are with the MPI; main mass with finder.


from The Meteoritical Bulletin, No. 101, Meteoritics & Planetary Science

Dar al Gani 1058

Al Jufrah, Libya
Found: 1998 Sep 9

Lunar meteorite (feldspathic breccia)

History: A fairly large stone was found in 1998 September on the Dar al Gani plateau, Libya, near the find site of Dar al Gani 400.

Physical characteristics: Compact, fine grained gray stone (1815 g) with visible whitish to pale gray clasts and partially coated by orange-brown weathering products.

Petrography: (A. Irving and S. Kuehner, UWS) Very fine grained melt matrix breccia with larger feldspathic clasts. Minerals are anorthite, olivine, low-Ca pyroxene, more calcic pigeonite, Ti-bearing chromite, ilmenite and troilite.

Geochemistry: Olivine (Fa16.0-33.9; FeO/MnO = 90-108), low-Ca pyroxene (Fs29.8-30.3Wo4.8-6.4, FeO/MnO = 50-57), pigeonite (Fs33.7Wo10.2; Fs43.6Wo7.3; FeO/MnO = 59-61). Bulk composition (R. Korotev, WUSL): mean values from INAA of subsamples are 3.0 wt.% FeO, 5.1 ppm Sc, 80 ppm Ni, 1.4 ppm La, 0.6 ppm Sm, 0.69 ppm Eu, 0.48 ppm Yb, 0.2 ppm Th.

Classification: Lunar (feldspathic breccia). This specimen was found close to Dar al Gani 400, and similarities in mineralogy and bulk composition indicate that these are likely paired.

Specimens: A total of 25 g of type material is on deposit at UWS. The remainder is held by an anonymous collector.



More Information

Meteoritical Bulletin Database

Dar al Gani 400 | 1058

References

Arai T., Yamamoto A., Ohtake M., Matsunaga T., Haruyama J., Hiroi T., Sasaki S., and Matsui T. (2011) Lunar crustal mineralogy inferred from lunar meteorites and Kaguya data (abstract). The 34rd Symposium on Antarctic Meteorites, p. 3-4, Tokyo.

Arai T., Hiroi T., Sasaki S., and Matsui T. (2013) Origin of the lunar crust inferred from mineralogy and reflectance spectra of lunar meteorites (abstract). In 44th Lunar and Planetary Science Conference, abstract no. 1016.

Bogard D.D., Garrison D. H., and Nyquist L. E. (2000) Argon-39–argon-40 ages of lunar highland rocks and meteorites (abstract). In Lunar and Planetary Science XXXI, abstract no. 1138, Lunar and Planetary Institute.

Bukovanska M., Dobosi G., Brandstätter F., and Kurat G. (1999) Dar al Gani 400: Petrology and geochemistry of some major lithologies, Meteoritics & Planetary Science 34, A21.

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Cohen B. A., Swindle T. D., and Kring D. A. (2005) Geochemistry and 40Ar-39Ar geochronology of impact-melt clasts in feldspathic lunar meteorites: Implications for lunar bombardment history. Meteoritics & Planetary Science 40, 755-777.

Consolmagno G. J., Russell S. S., and Jeffries T. E. (2004) An in–situ study of REE abundances in three anorthositic impact melt lunar highland meteorites (abstract). Lunar and Planetary Science XXXV, abstract no. 1370, Lunar and Planetary Institute.

Fischer-Gödde M., Becker H., Wombacher F. (2010) Highly siderophile element abundances and 187Os/188Os in lunar impact melt rocks: Implications for late accretion processes in the Earth-Moon system meteorites (abstract). In Lunar and Planetary Science XLI, abstract no. 2262, 41st Lunar and Planetary Science Conference.

Joy K. H. (2013) Trace elements in lunar plagioclase as indicators of source lithology (abstract). In 44th Lunar and Planetary Science Conference, abstract no. 1033.

Joy K. H., Crawford I. A., Russell S. S., Swinyard B., Kellett B., and Grande M. (2006) Lunar regolith breccias MET 01210, PCA 02007 and DAG 400: Their importance in understanding the lunar surface and implications for the scientific analysis of D-CIXS data (abstract). In Lunar and Planetary Science XXXVII, abstract no. 1274, Lunar and Planetary Institute.

Joy K. H., Crawford I. A., Russell S. S., and Kearsley A. T. (2010) Lunar meteorite regolith breccias: An in situ study of impact melt composition using LA-ICP-MS with implications for the composition of the lunar crust. Meteoritics & Planetary Science 45, 917–946.

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Korotev R. L., Jolliff B. L., Zeigler R. A., Gillis J. J., and Haskin L. A. (2003) Feldspathic lunar meteorites and their implications for compositional remote sensing of the lunar surface and the composition of the lunar crust, Geochim. Cosmochim. Acta 67, 4895-4923.

Nishiizumi K. (2003) Exposure histories of lunar meteorites (abstract). In Evolution of Solar System Materials: A New Perspective from Antarctic Meteorites, p. 104, National Institute of Polar Research, Tokyo.

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Scherer P., Pätsch M., and Schultz L. (1998) Noble-Gas study of the new lunar highland meteorite Dar al Gani 400. Meteoritics & Planetary Science 33, A135-A136.

Schlüter J., Schultz L., Thiedig F., Al-Mahdi B. O., and Abu Aghreb A. E. (2002) The Dar al Gani meteorite field (Libyan Sahara): Geological setting, pairing of meteorites, and recovery density, Meteoritics & Planetary Science 37, 1079-1093.

Semenova A. S., Nazarov M. A., Kononkova N. N., Patchen A., Taylor L. A. (2000) Mineral chemistry of lunar meteorite Dar al Gani 400 (abstract), in Lunar and Planetary Science XXXI, CD-ROM #1252.

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Zipfel J., Spettel B., Palme H., Wolf D., Franchi I., Sexton A. S., Pillinger C. T., and Bischoff A. (1998) Dar al Gani 400: Chemistry and petrology of the largest lunar meteorite. Meteoritics & Planetary Science 33, A171.



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Prepared by:

Randy L. Korotev


Department of Earth and Planetary Sciences
Washington University in St. Louis


Please don't contact me about the meteorite you think you've found until you read this and this.

e-mailkorotev@wustl.edu

Last revised: 04-Mar-2014